Valve for blowing-engines.



PATENTED DEC. 27, 1904.

APPLICATION FILED SEPT. 8, 1902.

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warnassas if/u d 4/ 0 w sll-lll' PATENTED DEC. 27, 1904.

A. T. KELLER. VALVE FOB. BLOWING ENGINES.

APPLICATION FILED SEPT. 3, 1902.

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WITNESSES '2 I -l g uzxa 4 Patented December 27, 1904.

PATENT OFFICE.

ALBERT T. KELLER, OF l/VILKINSBURG, PENNSYLVANIA.

VALVE FOR BLOWING-ENGINES.

SPECIFICATION forming part of Letters Patent No. 778,493, dated December 27, 1904.

Application filed September 3, 1902. Serial No. 121,948- I all whom it may concern.-

Be it known that I, ALBERT T. KELLER, a citizen of the United States, residing at l/Vilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented or discovered a certain new and useful Improvement in Valves for Blowing-Engines, of which improvement the following is a specification.

The invention described herein relates to certain improvements in valves for blowingengines, and has for its object a construction wherein a perfect balance of the inlet and outlet valves can be attained with a large capacity for the in and out flow of the air.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of thisspecification, Figure l is a sectional elevation of the cylinder of a blowingengine having my improvements applied thereto. Fig. 2 is asectional view on a plane indicated by the line H 11, Fig. 1. Figs. 3 and at are sectional plans on planes indicated by the lines 111 III and IV 1V, Fig. 1, looking in the direction of the arrows a7 and y, respectively.

In the practice of my invention the valvechambers 1 and l are formed in and transversely of the heads 2 and 2 and have their axes coincident with the chords of a circle, on opposite sides of the diameter thereof. These chambers connect with the interior of the cylinder by ports 3 and 3, formed by cutting away the peripheral walls at points intermediate of the ends of the chambers, thereby dividing the valve-chambers into two sections. Inlet-passages 4 and outlet-passages 4* are formed in the heads, said passages being connected, respectively, to the sections of the valve-chambers by ports 5 and 5, located adjacent to the ends of said chambers. The inlet-passages 4, with their ports 5 leading to the valve-chambers, are separated from the passages 4 and ports 5 by partitions a. The valves 6 and 6 are madein the form of openended cylinders provided with intersecting or cross arms, to which the operating-rods 7 are connected. These valves are provided with ports 8, adapted when the valves are in open position to fully register with the ports 5and 5 in the sections of the valve-chambers. The ports 3 3 are closed by the valves when shifted inwardly,said valves extending entirely across said ports from one section of the valve-chamber to the other and hearing at their inner ends against shoulders or abutments 9.

It is characteristic of my improved valve mechanism that the valve proper is subjected to the same pressure at all points whether such pressure acts on the inner or other surface. The valves controlling the flow to the compression-chamber will during the movement of the piston in one direction be subjected to internal pressure by the fluid from the compression chamber, such pressure entering through the ports 5 to the interior of the valve. When the piston moves in the opposite direction, the same valves will be subjected to the same internal pressure and the parts extending across the port 3 to a gradually-increasing external pressure which acts equally on all sides of the valve. Hence the valve is in a balanced condition when the pressure acts externally or internally, or both.

The valves may be operated in any suitable manner known in the.artas, for example, by means of bell-crank levers l0, suitably mounted so that one end will bear against.

shoulders or collars on the rods 7 to shift the valves to open position against the tension of springs 11. The other arms of the levers 10 are connected by suitable interposed mechanism to an eccentric or eccentrics on the shaft of the engine. It will be observed that the valve-shifting mechanism is so constructed and arranged that the outlet-valves at one end will close as soon as the piston has begun its movement away from such end; but the outlet-valve at the other end will not open until the piston has moved sufliciently far to effect the desired compression.

It will be observed that the ports 5, 5 and 8 in the valve-case and valve are not entirely out of register with each other and are employed to provide a passage or communication between the interior of the valve and the passages 4 4 in addition to that provided by the ports 5 5 at the end of the shells and the open end of the valve. Hence either one or both of these means of communication can be employed.

When the piston is moving down, as in Figs. 1 and 2, the valve 6 at the upper end of the cylinder will be open, and air will flow in through passages 4 and ports 5 into the cylindrical valve and thence by the port 3 into the compressing-cylinder. As soon as the compressing-piston has moved down sufficiently far to etfect the required compres sion, the valve 6 at the lower end of the cylinder is opened, so that the compressed air will flow through port 3 into the cylindrical valve, through ports 8 and 5 into passages 4*, leading to the compression-chamber. The direction of flow of the air into and from the cylinder is clearly indicated by arrows.

1 claim herein as my invention-- 1. A blowing-engine having formed in and In testimony whereof I have hereunto set my hand.

ALBERT T. KELLER. \Vitnesses:

DARWIN S. oLoorr, G-Eo. B. BLEMING. 

